Handle RBD attributes with a migration script

Also remove rbd_secret_uuid to an attribute (not used at all),
add a ceph_conf attribute.
Switch to userspace rbd implementation for SUSE

Do not install the ceph kmp's anymore. Instead install
the python bindings
Merge pull request #107 from dirkmueller/release/roxy/master

Merge RBD Support Patches for SUSE